Quarterly report pursuant to Section 13 or 15(d)

Available-for-Sale Securities, Weighted Average Life Classifications (Details)

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Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 282  
Greater than 1 year and less than or equal to 3 years 16,243  
Greater than 3 years and less than or equal to 5 years 177,196  
Greater than 5 years and less than or equal to 10 years 7,988,501  
Greater than 10 years 322  
Available-for-sale securities, at fair value 8,182,544 $ 8,327,149
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 282  
Greater than 1 year and less than or equal to 3 years 16,243  
Greater than 3 years and less than or equal to 5 years 177,196  
Greater than 5 years and less than or equal to 10 years 7,984,870  
Greater than 10 years 0  
Available-for-sale securities, at fair value 8,178,591 8,322,999
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 0  
Greater than 1 year and less than or equal to 3 years 0  
Greater than 3 years and less than or equal to 5 years 0  
Greater than 5 years and less than or equal to 10 years 3,631  
Greater than 10 years 322  
Available-for-sale securities, at fair value $ 3,953 $ 4,150